From 5470c3565cfb4b9e3827a42bfdc3fbec461638a5 Mon Sep 17 00:00:00 2001
From: vrouvrea <vrouvrea@636b058d-ea47-450e-bf9e-a15bfbe3eedb>
Date: Tue, 12 Sep 2017 10:05:46 +0000
Subject: Fix in Python3 if sphinx is not installed

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/cythonization_improvement@2663 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 0005d7fe2e7e8513a276543295c02351456595cc
---
 src/cmake/modules/GUDHI_third_party_libraries.cmake | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/cmake/modules/GUDHI_third_party_libraries.cmake b/src/cmake/modules/GUDHI_third_party_libraries.cmake
index dbf2106a..4cf2f445 100644
--- a/src/cmake/modules/GUDHI_third_party_libraries.cmake
+++ b/src/cmake/modules/GUDHI_third_party_libraries.cmake
@@ -122,8 +122,12 @@ if(PYTHONINTERP_FOUND AND CYTHON_FOUND)
     # Documentation generation is available through sphinx
     find_program( SPHINX_PATH sphinx-build )
   elseif(PYTHON_VERSION_MAJOR EQUAL 3)
-    # No sphinx-build in Pyton3, just hack it
-    set(SPHINX_PATH "${CMAKE_CURRENT_BINARY_DIR}/${GUDHI_CYTHON_PATH}/doc/python3-sphinx-build")
+    execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "from sphinx import main"
+                    RESULT_VARIABLE SPHINX_MODULE_IS_INSTALLED)
+    if(SPHINX_MODULE_IS_INSTALLED)
+      # No sphinx-build in Pyton3, just hack it
+      set(SPHINX_PATH "${CMAKE_CURRENT_BINARY_DIR}/${GUDHI_CYTHON_PATH}/doc/python3-sphinx-build")
+    endif(SPHINX_MODULE_IS_INSTALLED)
   else()
     message(FATAL_ERROR "ERROR: Try to compile the Cython interface. Python version ${PYTHON_VERSION_STRING} is not valid.")
   endif(PYTHON_VERSION_MAJOR EQUAL 2)
-- 
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